Research On High Speed Amphibious Vehicle's Virtual Prototype Technology Based On Wheel's Retracted And Deployed

High-speed is an important tactical performance indicator for amphibious vehicles, and is also a significant research direction. To raise the speed of our amphibious vehicles, water-jet selection, arrangement and body design works are completed in this article, based on existing models; some related researches on waterborne and overland double performance are done for the re-constructing vehicle by using virtual prototyping technology.Comprehensively considered the match of the propeller and the engine power, size, etc.and based on the principle of the thrust and drag forces balance principle, a reasonable water jet propulsion is selected. Simultaneously, the sailing speed is determined, which provided a basis for the next fluid dynamics analysis. In addition, the amphibious car's waterborne and overland double-driven lines are defined, and the waterborne driven line arrangement is completed.In body design process, the whole vehicle is divided into three parts-head, middle and rear. Reference on high speed amphibious vehicle body features and high speed craft dynamics theories, the three parts are designed, respectively, in CATIA shape-design module. Still a fresh style of wash plate is designed. In Gambit, hybrid grid technology and the dimensions control function are used, in order to gain reasonable grid for two amphibious vehicle analysis models: one with wash plate and the other without. In Fluent, VOF method, k ?εstandard turbulence model, open channel flow and geometric reconstruction are applied to get comparative analysis of the two models waterborne performance. The results show that the model with wash plate has the better waterborne performance.According to the characteristics of the wheels'retracting and parameters, the ADAMS/Car software is used to build the vehicle front and rear suspension subsystems, steering subsystem, body subsystem, the tires subsystem and the whole vehicle model. Based on national vehicle test standards, controllability and stability virtual simulation test-steering step, steady-state of rotary, snake and steering efforts, are done in ADAMS/Car.The analysis results illustrate that the vehicle's controllability and stability is good.